Cold chain knowledge, minus the jargon wall.
Six deep reads, eight numbers worth remembering, and a glossary for the acronyms. Everything is sourced, so you can check our homework.
The two degrees that decide everything
Why 2 to 8°C is less a rule than a margin of safety, and what freezing quietly does to a vial that still looks perfect.
Read the article
Probes, not guesses
Air temperature lies. A small bottle of glycol tells the truth. How a monitoring setup earns its place on the shelf.
Kenya's fridge story, and the part nobody photographs
Thousands of new vaccine fridges, a push for solar, and one stubborn lesson: buying the equipment is the easy part.
When the lights go out: mains, ice-lined or solar?
Three ways to keep a fridge cold through unreliable power, and a quick picker to find your starting point.
Winning the tender before you submit it
Public procurement in Kenya rewards the supplier who makes the buyer's job easy. A plain-spoken guide to getting your paperwork ready.
Twelve questions to ask before you buy a medical fridge
The brochure shows litres and colours. These questions show what the fridge will be like on a bad Thursday.
Eight figures. Tap any to see where it came from.
Things people say in clinic corridors.
How the evidence and Kenya's fridges grew up together.
Systematic review in Vaccine collects the evidence on freezing in the cold chain.4
WHO Bulletin validates the shake test across 475 vials.1
Eight solar direct-drive fridges prequalified by WHO PQS as of July 2013.4
Kenya applies to Gavi's CCEOP and begins its new-fridge programme.6
8,342 refrigerators deployed and 92% functionality reported.6
First phase delivers 2,061 storage units nationwide.7
2,000 more units flagged off, solar and mains.7
Acronyms, decoded.
A temperature probe suspended in glycol, glass beads, sand or similar, so it reflects product temperature rather than air.
Gavi's Cold Chain Equipment Optimisation Platform, a funding route for approved cold chain equipment.
A device that records temperature at intervals and lets you review the history.
Any period when temperature leaves the allowed range, hot or cold.
A product, typically with an aluminium adjuvant, that is permanently damaged by freezing.
How long a fridge stays within a safe temperature after power stops.
Ice-lined refrigerator. Mains-powered, with coolant lining the walls for long holdover.
Kenya Expanded Programme on Immunization.
Phase-change material, a coolant that absorbs heat as it melts to hold a steady temperature.
WHO's Performance, Quality and Safety programme that prequalifies immunisation equipment.
Kenya's Public Procurement Information Portal, where public tenders are published.
Solar direct-drive refrigerator, powered by panels without a battery.
Ultra-low temperature freezer, typically -40 to -86°C.
Vaccine vial monitor, a label that changes colour with cumulative heat exposure.
Where this all comes from.
- Kartoglu U, et al. Validation of the shake test for detecting freeze damage to adsorbed vaccines. Bulletin of the World Health Organization, 2010;88(8):624-631. scielosp.org ↗
- US CDC. Temperature monitoring equipment (Vaccine Storage and Handling). cdc.gov ↗
- Immunize.org. Ask the Experts: Temperature Monitoring & Controls (last reviewed 10 April 2026). www.immunize.org ↗
- PATH and Gavi, Optimize project. The need for ongoing innovation in vaccine cold chain equipment (cites Vaccine 2007;25(20):3980-3986). www.technet-21.org ↗
- Gavi. Product information: vaccines and cold chain equipment (updated 12 February 2026). www.gavi.org ↗
- SEforALL and CHAI. Chilling Prospects 2022: Expanding the vaccine cold chain in Kenya through innovative cooling solutions. www.seforall.org ↗
- Chimbi J. No power? No problem: for rural Kenyan vaccinators, a solar fridge is a ray of sunshine. Gavi VaccinesWork, 26 May 2026. www.gavi.org ↗
- TechNet-21 discussion. When to consider solar based on hours of mains/generator electricity available each day. technet-21.org ↗
- Access to Government Procurement Opportunities (AGPO), Government of Kenya. About AGPO. agpo.go.ke ↗
- Nation Africa. State contracts to women and youth cross Sh28bn. nation.africa ↗
- National Water Harvesting and Storage Authority. Procurement notices (tenders published on the PPIP portal). waterauthority.go.ke ↗
- Public health practice flyer. A step-by-step guide to selecting and using a data logger for vaccine inventory (Alabama Department of Public Health). www.alabamapublichealth.gov ↗
- PPP Magazine. CDC guidelines for temperature monitoring (June 2015). pppmag.com ↗
- Office of the Data Protection Commissioner, Kenya. Frequently asked questions. www.odpc.go.ke ↗
- Republic of Kenya. The Data Protection Act, No. 24 of 2019. www.odpc.go.ke ↗
- Capital FM. ODPC gives data handlers 14 days to renew expired certificates. capitalfm.africa ↗
Figures were checked against the sources above on 27 October 2026. These articles are general information, not medical, legal or financial advice. Always follow your national guidelines and tender documents.
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